Age of War is a lane-based strategy game where the "lane" is also a timeline: you start in the Stone Age with clubs and dinosaurs, and every time you earn enough evolution points, you jump forward — Medieval knights and catapults, then modern tanks and soldiers, eventually full-blown mechs and spaceships. Both you and the AI opponent evolve independently, so it's entirely possible to find yourself defending with future tech against an enemy still throwing spears, or the other way around if you fall behind.
The core loop is straightforward — spend resources to spawn units that automatically march down the lane toward the enemy base, upgrade your turret for direct damage, and evolve to unlock stronger units — but the timing of when to evolve versus when to keep pumping out your current tier's units is where actual strategy comes in. Evolve too early and you're weak while the new units unlock; evolve too late and you fall behind the AI's tech.
The escalation from cavemen to spaceships gives every run a real sense of progress, and the tug-of-war lane format keeps matches tense right up to the final base hit. If you enjoy this style of play, GBK Games also has the direct sequel Age of War 2 with more ages and unit variety.